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#include <iostream>

using namespace std;

int main()
{
    int k,a,b,w=0;
    cin>>k>>a>>b;

    for(int i=k>a?k:((a-1)/k+1)*k;i<=b;i+=k)
    {
        int sumak=0;
        int l=i;
        while(l)
        {
            sumak+=(l%10)*(l%10);
            l/=10;
        }
        if(k*sumak==i)
            w+=1;
    }
    cout<<w;
    return 0;
}